[Talk-us] GNIS?

[Mike Thompson]

The wiki (http://wiki.openstreetmap.org/wiki/GNIS) doesn't mention "source
date", but it does mention:

   - gnis:created = *MM/DD/YYYY when the GNIS entry was created  *

*
*
I presume that "source date" is the date of the export from the GNIS which
was then imported to OSM.  Might be useful if someone wants to compare OSM
to GNIS in the future as the two sources will diverge over time.

BTW, for most peaks are there not "official" elevations?

Mike


On Sun, Jun 16, 2013 at 5:42 PM, Thomas Colson <thomas_colson at nps.gov>wrote:

> We’re using Lidar (+/- 19 cm vertical precision) and/or OPUS GPS for
> elevations of highest point as determined by zonal statistics, or the brass
> disc found on many peaks. On that note, though, while preserving the tags,
> if you modify the elevation, do you keep the GNIS source date?****
>
> ** **
>
> *From:* Mike Thompson [mailto:miketho16 at gmail.com]
> *Sent:* Sunday, June 16, 2013 7:33 PM
> *To:* Thomas Colson
> *Subject:* Re: [Talk-us] GNIS?****
>
> ** **
>
> I preserve the tags.  It is easy to do.****
>
> ** **
>
> BTW, the reason the elevation of the GNIS mountain peaks is incorrect is
> that GNIS takes the elevation from the National Elevation Dataset.  This is
> a gridded dataset.  The value for any particular grid cell will generally
> not be the same as any particular surveyed spot height within it.****
>
> ** **
>
> Mike****
>
> ** **
>
> On Sun, Jun 16, 2013 at 5:20 PM, Thomas Colson <thomas_colson at nps.gov>
> wrote:****
>
> Is it preferable to keep the original GNIS tags if updating a GNIS object
> in
> OSM? E.g. updating say the location and elevation, everything else is the
> same. In context, GNIS mountain is here, but really it's there (which is
> usually the case for GNIS).
>
> Or, just leave the GNIS object alone, and add a new OSM feature? Not sure
> how folks feel about GNIS.
>
>
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>
> ** **
>
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